<!DOCTYPE html>
<html lang="en-US">
    <head>
        <title>Parse::Keyword - DEPRECATED: write syntax extensions in perl - metacpan.org</title>
        <link rel="preload" as="fetch" href="https://metacpan.org/account/login_status" crossorigin="anonymous" />
        <link href="https://metacpan.org/_assets/b8ccceeed47a0652049703d99326a9cea4933443.css" rel="stylesheet" type="text/css">
        <script src="https://metacpan.org/_assets/6bfedafe2d7caa915b7d84f61b45936818e3242e.js" type="text/javascript" defer></script>
        <link rel="alternate" type="application/rss+xml" title="Recent CPAN Uploads of Parse-Keyword - MetaCPAN" href="https://metacpan.org/dist/Parse-Keyword/releases.rss" />
        <link rel="canonical" href="./Parse::Keyword.html" />
        <meta name="description" content="DEPRECATED: write syntax extensions in perl" />
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5">
        <link rel="shortcut icon" href="https://metacpan.org/static/icons/favicon.ico">
        <link rel="apple-touch-icon" sizes="152x152" href="https://metacpan.org/static/icons/apple-touch-icon.png">
        <link rel="search" href="https://metacpan.org/static/opensearch.xml" type="application/opensearchdescription+xml" title="MetaCPAN">
        <script>
          (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
          (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
          m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
          })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

          (function(skey, ga_id){
            ga('create', ga_id, {
              siteSpeedSampleRate : 100,
              storage             : 'none',
              clientId            : localStorage.getItem(skey)
            });
            ga(function(tracker) {
              localStorage.setItem(skey, tracker.get('clientId'));
            });
            ga('send', 'pageview');
          })('ga:clientId', 'UA-27829474-1');
        </script>
<meta name="twitter:card"        content="summary" />
<meta name="twitter:url"         content="https://metacpan.org/pod/Parse::Keyword" />
<meta name="twitter:title"       content="Parse::Keyword" />
<meta name="twitter:description" content="DEPRECATED: write syntax extensions in perl" />
<meta name="twitter:site"        content="metacpan" />
    </head>
    <body>
        <nav class="navbar navbar-default" role="navigation">
            <div class="header-logo-large hidden-xs">
              <a href="https://metacpan.org/" tabindex="0">
                <svg class="logo" aria-label="MetaCPAN">
                  <use class="logo" href="/static/images/metacpan-logo.svg#logo" />
                </svg>
              </a>
            </div>
            <div class="header-logo-icon visible-xs">
              <a href="https://metacpan.org/">
                <svg class="logo" aria-label="MetaCPAN">
                  <use class="logo" href="/static/images/metacpan-logo.svg#dots" />
                </svg>
              </a>
            </div>
            <ul class="nav navbar-nav menu-items hidden-xs hidden-sm">
              <li><a href="https://metacpan.org/about">About</a></li>
              <li><a href="https://metacpan.org/about/sponsors">Sponsor</a></li>
              <li><a href="https://grep.metacpan.org/">grep::cpan</a></li>
              <li><a href="https://metacpan.org/recent">Recent</a></li>
              <li><a href="https://metacpan.org/about/faq">FAQ</a></li>
              <li><a href="https://metacpan.org/tools">Tools</a></li>
              <li><a href="https://fastapi.metacpan.org/">API</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <button type="button" class="searchbar-btn visible-xs visible-sm">
                    <i class="fa fa-search button-fa-icon"></i>
                </button>
                <form action="https://metacpan.org/search" class="searchbar-form visible-md visible-lg search-form form-horizontal">
                   <input type="hidden" name="size" id="metacpan_search-size" value="20">
                  <div class="form-group">
                      <div class="search-group">
                        <i class="fa fa-search"></i>
                        <input type="text" name="q" placeholder="Search the CPAN" size="41" autocorrect="off" autocapitalize="off" spellcheck="false" id="metacpan_search-input" class="form-control" value="">
                      </div>
                  </div>
                </form>
                    <li class="icon-slidepanel visible-xs visible-sm">
                      <button data-toggle="slidepanel" data-target=".slidepanel">
                        <span class="button-fa-icon">
                          <i class="fa fa-bars slidepanel-open"></i>
                          <i class="fa fa-times slidepanel-close"></i>
                        </span>
                      </button>
                    </li>
                <form action="https://metacpan.org/account/logout" method="POST" id="metacpan-logout"></form>
                <li class="dropdown logged_in" style="display: none;">
                    <button type="button" class="dropdown-toggle" data-toggle="dropdown">
                      <i class="fa fa-user button-fa-icon logged-in-icon" aria-hidden="true"></i>
                      <i class="fas fa-chevron-down"></i>
                    </button>
                    <ul class="dropdown-menu">
                        <li><a href="https://metacpan.org/account/identities">Identities</a></li>
                        <li><a href="https://metacpan.org/account/profile">Profile</a></li>
                        <li><a href="https://metacpan.org/account/favorite/list">Favorites</a></li>
                        <li>
                            <a href="./Parse::Keyword.html#" type="button" onclick="$('#metacpan-logout').submit(); return false">
                              Logout
                            </a>
                        </li>
                    </ul>
                </li>
                <li class="dropdown logged_out" style="display: none;">
                    <button type="button" class="dropdown-toggle" data-toggle="dropdown">
                      <i class="fa fa-user button-fa-icon" aria-hidden="true"></i>
                      <i class="fas fa-chevron-down"></i>
                    </button>
                    <ul class="dropdown-menu">
                        <li>
                            <a href="https://metacpan.org/login/github">
                                <i class="fab fa-github fa-fw"></i>
                                GitHub
                            </a>
                        </li>
                        <li>
                            <a href="https://metacpan.org/login/twitter">
                                <i class="fab fa-twitter fa-fw"></i>
                                Twitter
                            </a>
                        </li>
                        <li>
                            <a href="https://metacpan.org/login/google">
                                <i class="fab fa-google fa-fw"></i>
                                Google
                            </a>
                        </li>
                    </ul>
                </li>
                <li class="dropdown logged_placeholder">
                    <button>
                      <i class="fa fa-user button-fa-icon" aria-hidden="true"></i>
                    </button>
                </li>
            </ul>
        </nav>
        <div class="page-content ">
          <!--
          <div class="top-notify-banner">
            <i class="fas fa-info-circle"></i>
          </div>
          -->
          <nav class="sidebar">
            <div class="slidepanel">
              <ul class="nav-list ">
    <li class="nav-header no-margin-top">
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The date that this version of Parse-Keyword was released.">
      <span class="relatize">02 Feb 2017 20:53:43 UTC</span>
    </li>
  <li>
    Distribution: <a href="https://metacpan.org/dist/Parse-Keyword">Parse-Keyword</a>
  </li>
  <li>
    Module version: 0.09
  </li>
  <li>
    <a data-keyboard-shortcut="g s" href="https://metacpan.org/dist/Parse-Keyword/source/lib/Parse/Keyword.pm">Source</a>
    (<a href="https://metacpan.org/dist/Parse-Keyword/source/lib/Parse/Keyword.pm?raw=1">raw</a>)
  </li>
  <li>
    <a data-keyboard-shortcut="g b" href="https://metacpan.org/dist/Parse-Keyword/source/lib/Parse">Browse</a>
    (<a href="https://metacpan.org/dist/Parse-Keyword/source/lib/Parse?raw=1">raw</a>)
  </li>
    <li>
      <a data-keyboard-shortcut="g c" href="https://metacpan.org/dist/Parse-Keyword/changes">Changes</a>
    </li>
    <li>
      <a rel="noopener nofollow" class="nopopup" href="http://metacpan.org/release/Parse-Keyword">Homepage</a>
    </li>
    <li>
      <a class="nopopup" href="https://metacpan.org/dist/Parse-Keyword/contribute">How to Contribute</a>
    </li>
    <li>
        <a rel="noopener nofollow" data-keyboard-shortcut="g r" href="https://github.com/haarg/Parse-Keyword">Repository</a>
    </li>
    <li>
      <a rel="noopener nofollow" data-keyboard-shortcut="g i" href="https://rt.cpan.org/Public/Dist/Display.html?Name=Parse-Keyword">Issues</a>
      (1)
    </li>
    <li>
      <a rel="noopener nofollow" href="http://matrix.cpantesters.org/?dist=Parse-Keyword+0.09" title="Matrix">Testers</a>
        <span title="(pass / fail / na)">(<a rel="noopener nofollow" href="https://www.cpantesters.org/distro/P/Parse-Keyword.html?oncpan=1&amp;distmat=1&amp;version=0.09&amp;grade=2" style="color: #090">282</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/P/Parse-Keyword.html?oncpan=1&amp;distmat=1&amp;version=0.09&amp;grade=3" style="color: #900">1</a> / <a rel="noopener nofollow" href="https://www.cpantesters.org/distro/P/Parse-Keyword.html?oncpan=1&amp;distmat=1&amp;version=0.09&amp;grade=4">2</a>)</span>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpants.cpanauthors.org/release/HAARG/Parse-Keyword-0.09">Kwalitee</a>
    </li>
    <li>
      <div class="ttip" data-toggle="tooltip" data-placement="bottom" title="The # people with an indexing permission on Parse-Keyword who have released something to CPAN in the last 2 years (i.e. the # people likely able to release critical fixes in a timely manner)">
      Bus factor: 1
      </div>
    </li>
    <li>
      <a rel="noopener nofollow" href="http://cpancover.com/latest/Parse-Keyword-0.09/index.html">100.00% Coverage </a>
    </li>
    <li>
      License: mit
    </li>
    <li>
      Perl: v5.14.0
    </li>
    <li class="nav-header">Activity</li>
    <li>
<div class="activity-graph">
    <img src="https://metacpan.org/dist/Parse-Keyword/activity.svg?res=month" />
    <div class="comment">24 month</div>
</div>
    </li>
    <li class="nav-header">Tools</li>
    <li>
      <a itemprop="downloadUrl" href="https://cpan.metacpan.org/authors/id/H/HA/HAARG/Parse-Keyword-0.09.tar.gz">
      Download (<span itemprop="fileSize">21.64KB</span>)</a>
    </li>
    <li>
      <a href="https://explorer.metacpan.org/?url=%2Fmodule%2FHAARG%2FParse-Keyword-0.09%2Flib%2FParse%2FKeyword.pm">
        MetaCPAN Explorer
      </a>
    </li>
    <li>
      <a href="https://metacpan.org/dist/Parse-Keyword/permissions">
        Permissions
      </a>
    </li>
    <li>
      <a href="https://metacpan.org/dist/Parse-Keyword/releases.rss">
        Subscribe to distribution
      </a>
    </li>
    <li>
      <button class="btn btn-link" data-toggle="modal" data-target="#metacpan_install-instructions-dialog">
        Install Instructions
      </button>
    </li>
    <li>
      <form action="https://metacpan.org/search">
        <input type="hidden" name="q" value="dist:Parse-Keyword">
        <input type="search" name="q" placeholder="Search distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
      </form>
    </li>
    <li>
      <form action="https://grep.metacpan.org/search">
        <input type="hidden" name="qd" value="Parse-Keyword">
        <input type="hidden" name="source" value="metacpan">
        <input type="search" name="q" placeholder="grep distribution" class="form-control tool-bar-form">
        <input type="submit" style="display: none">
     </form>
    </li>
    <li class="version-jump">
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/Parse/Keyword.pm&#39;" class="form-control tool-bar-form">
  <option disabled selected>Jump to version</option>
<option
  disabled
  value="HAARG/Parse-Keyword-0.09"
>0.09
  (HAARG on 2017-02-02)</option>
<option
  
  value="DOY/Parse-Keyword-0.08"
>0.08
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.07"
>0.07
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.06"
>0.06
  (DOY on 2013-08-01)</option>
<optgroup label="BackPAN">'
<option
  
  value="DOY/Parse-Keyword-0.05"
>0.05
  (DOY on 2013-07-25)</option>
<option
  
  value="DOY/Parse-Keyword-0.04"
>0.04
  (DOY on 2013-07-24)</option>
<option
  
  value="DOY/Parse-Keyword-0.03"
>0.03
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.02"
>0.02
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.01"
>0.01
  (DOY on 2013-07-21)</option>
</optgroup>
</select>
    </li>
    <li class="version-diff">
<select onchange="document.location.href='/release/HAARG/Parse-Keyword-0.09/diff/' + encodeURIComponent(this.value) + '/lib/Parse/Keyword.pm'
" class="form-control tool-bar-form">
  <option disabled selected>Diff with version</option>
<option
  disabled
  value="HAARG/Parse-Keyword-0.09"
>0.09
  (HAARG on 2017-02-02)</option>
<option
  
  value="DOY/Parse-Keyword-0.08"
>0.08
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.07"
>0.07
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.06"
>0.06
  (DOY on 2013-08-01)</option>
<optgroup label="BackPAN">'
<option
  
  value="DOY/Parse-Keyword-0.05"
>0.05
  (DOY on 2013-07-25)</option>
<option
  
  value="DOY/Parse-Keyword-0.04"
>0.04
  (DOY on 2013-07-24)</option>
<option
  
  value="DOY/Parse-Keyword-0.03"
>0.03
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.02"
>0.02
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.01"
>0.01
  (DOY on 2013-07-21)</option>
</optgroup>
</select>
    </li>

    <li>
<ul class="dependencies">
  <li class="nav-header">Dependencies</li>
  <li><a href="./Devel::CallParser.html" title="Devel::CallParser" class="ellipsis">Devel::CallParser</a></li>
  <li><a href="https://metacpan.org/pod/XSLoader" title="XSLoader" class="ellipsis">XSLoader</a></li>
  <li><a href="https://metacpan.org/pod/strict" title="strict" class="ellipsis">strict</a></li>
  <li><a href="https://metacpan.org/pod/warnings" title="warnings" class="ellipsis">warnings</a></li>
  <li>
    <hr>
  </li>
  <li>
    <a href="https://metacpan.org/module/Parse::Keyword/requires">Reverse dependencies</a>
  </li>
  <li>
    <a href="http://deps.cpantesters.org/?module=Parse%3A%3AKeyword">CPAN Testers List</a>
  </li>
  <li>
    <a href="https://cpandeps.grinnz.com/?dist=Parse-Keyword">Dependency graph</a>
  </li>
</ul>
    </li>
    <li class="nav-header">Permalinks</li>
    <li>
      <a href="https://metacpan.org/release/HAARG/Parse-Keyword-0.09/view/lib/Parse/Keyword.pm">This version</a>
    </li>
    <li>
      <a href="./Parse::Keyword.html">Latest version</a>
    </li>
    <li>
<div class="plussers">
<div class="nav-header">++ed by:</div>
<div>
<a class="display-all" href="https://metacpan.org/author/STEVAN"><img src="https://www.gravatar.com/avatar/cc55e2ce28bd4649215ef05b8704e9be?d=identicon&amp;s=20" title="STEVAN" alt="STEVAN"></a>
<a class="display-all" href="https://metacpan.org/author/TOBYINK"><img src="https://www.gravatar.com/avatar/f8faf2a422aecd1007b7d54c19ce7f39?d=identicon&amp;s=20" title="TOBYINK" alt="TOBYINK"></a>
<a class="display-all" href="https://metacpan.org/author/RHOELZ"><img src="https://www.gravatar.com/avatar/f6bd28630a0ef25bc41a07b3e9ede159?d=identicon&amp;s=20" title="RHOELZ" alt="RHOELZ"></a>
<a class="display-all" href="https://metacpan.org/author/DOY"><img src="https://www.gravatar.com/avatar/88766de7a058697d3d0335b8d384fd2a?d=identicon&amp;s=20" title="DOY" alt="DOY"></a>
</div>
<!-- Display counts of plussers-->
<div>
    <a href="https://metacpan.org/dist/Parse-Keyword/plussers">4 PAUSE users</a>
</div>
<div>
    2 non-PAUSE users
</div>
</div>
    </li>
    <li>
<div id="metacpan_contributors">
  <div>
    <button class="btn-link"
      onclick="$(this).hide(); $('#metacpan_contributors ul').slideDown(); return false;"
    >and 1 contributors</button>
  </div>
  <ul style="display: none">
    <li class="contributor"
      data-contrib-email="doy@tozt.net"
    >
      <img class="gravatar" width="20" height="20" src="https://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?d=identicon&amp;s=20" />
      Jesse Luehrs
    </li>
  </ul>
</div>
    </li>
              </ul>
            </div>
          </nav>
          <div class="content-navigation">
<div class="breadcrumbs">
  <span>
    <a data-keyboard-shortcut="g a" rel="author" href="https://metacpan.org/author/HAARG" class="author-name">Graham Knop</a>
  </span>
  <span>&nbsp;/&nbsp;</span>
  <div class="release dist-release status-latest maturity-released">
    <span class="dropdown"><b class="caret"></b></span>
<select onchange="document.location.href=&#39;/release/&#39;+this.value+&#39;/view/lib/Parse/Keyword.pm&#39;" class="">
<option
  selected
  value="HAARG/Parse-Keyword-0.09"
>0.09
  (HAARG on 2017-02-02)</option>
<option
  
  value="DOY/Parse-Keyword-0.08"
>0.08
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.07"
>0.07
  (DOY on 2013-10-10)</option>
<option
  
  value="DOY/Parse-Keyword-0.06"
>0.06
  (DOY on 2013-08-01)</option>
<optgroup label="BackPAN">'
<option
  
  value="DOY/Parse-Keyword-0.05"
>0.05
  (DOY on 2013-07-25)</option>
<option
  
  value="DOY/Parse-Keyword-0.04"
>0.04
  (DOY on 2013-07-24)</option>
<option
  
  value="DOY/Parse-Keyword-0.03"
>0.03
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.02"
>0.02
  (DOY on 2013-07-23)</option>
<option
  
  value="DOY/Parse-Keyword-0.01"
>0.01
  (DOY on 2013-07-21)</option>
</optgroup>
</select>
    <a data-keyboard-shortcut="g d" class="release-name" href="https://metacpan.org/dist/Parse-Keyword">Parse-Keyword-0.09</a>
  </div>
<span class="river-gauge-gauge">
  <svg width="24px"
       height="15px"
       version="1.1"
       xmlns="http://www.w3.org/2000/svg"
       xmlns:xlink="http://www.w3.org/1999/xlink">

    <g>
      <title>        River stage two &#10;
          • 6 direct dependents &#10;          • 35 total dependents
      </title>

      <rect x="0"  y="0" width="4" height="15" fill="#7ea3f2" />
      <rect x="5"  y="0" width="4" height="15" fill="#7ea3f2" />
      <rect x="10"  y="0" width="4" height="15" fill="#e4e2e2" />
      <rect x="15"  y="0" width="4" height="15" fill="#e4e2e2" />
      <rect x="20"  y="0" width="4" height="15" fill="#e4e2e2" />
    </g>
  </svg>

</span>
<div id="Parse-Keyword-fav" class="logged_in">
<form action="https://metacpan.org/account/favorite/add" style="display: inline" onsubmit="return favDistribution(this)">
    <input type="hidden" name="remove" value="0">
    <input type="hidden" name="release" value="Parse-Keyword-0.09">
    <input type="hidden" name="author" value="HAARG">
    <input type="hidden" name="distribution" value="Parse-Keyword">
    <button type="submit" class="favorite highlight"><span>6</span> ++</button>
</form>
</div>
<div class="logged_out">
<a href="./Parse::Keyword.html" onclick="alert('Please sign in to add favorites'); return false" class="favorite highlight">
<span>6</span> ++</a>
</div>
   / <span>Parse::Keyword</span>
</div>
          </div>
          <main class="content">

<input id="DEPRECATED" type="checkbox" class="notification-toggle-checkbox" />
<div id="metacpan_notification" class="well collapsed notify-DEPRECATED">
    <label class="remove-notification" for="DEPRECATED" >
      <i class="fa fa-fw fa-times black"></i>
    </label>
    <div id="metacpan_notification-container">
      <h2>Deprecated.</h2>
      <div>
The maintainer of this distribution has indicated that it is deprecated and no longer suitable for use.
      </div>
  </div>
</div>

<nav class="toc">
  <div class="toc-header"><strong>Contents</strong></div>
<ul>
  <li><a href="./Parse::Keyword.html#NAME">NAME</a></li>
  <li><a href="./Parse::Keyword.html#VERSION">VERSION</a></li>
  <li><a href="./Parse::Keyword.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./Parse::Keyword.html#DESCRIPTION">DESCRIPTION</a>
    <ul>
      <li><a href="./Parse::Keyword.html#DO-NOT-USE!">DO NOT USE!</a></li>
    </ul>
  </li>
  <li><a href="./Parse::Keyword.html#FUNCTIONS">FUNCTIONS</a>
    <ul>
      <li><a href="./Parse::Keyword.html#lex_peek($n)">lex_peek($n)</a></li>
      <li><a href="./Parse::Keyword.html#lex_read($n)">lex_read($n)</a></li>
      <li><a href="./Parse::Keyword.html#lex_read_space">lex_read_space</a></li>
      <li><a href="./Parse::Keyword.html#lex_stuff($str)">lex_stuff($str)</a></li>
      <li><a href="./Parse::Keyword.html#parse_block,-parse_stmtseq,-parse_fullstmt,-parse_barestmt,-parse_fullexpr,-parse_listexpr,-parse_termexpr,-parse_arithexpr">parse_block, parse_stmtseq, parse_fullstmt, parse_barestmt, parse_fullexpr, parse_listexpr, parse_termexpr, parse_arithexpr</a></li>
      <li><a href="./Parse::Keyword.html#compiling_package">compiling_package</a></li>
    </ul>
  </li>
  <li><a href="./Parse::Keyword.html#BUGS">BUGS</a></li>
  <li><a href="./Parse::Keyword.html#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="./Parse::Keyword.html#SUPPORT">SUPPORT</a></li>
  <li><a href="./Parse::Keyword.html#AUTHOR">AUTHOR</a></li>
  <li><a href="./Parse::Keyword.html#COPYRIGHT-AND-LICENSE">COPYRIGHT AND LICENSE</a></li>
</ul></nav>
<div class="pod anchors">
<h1 id="NAME">NAME</h1>

<p>Parse::Keyword - DEPRECATED: write syntax extensions in perl</p>

<h1 id="VERSION">VERSION</h1>

<p>version 0.09</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>  use Parse::Keyword { try =&gt; \&amp;try_parser };
  use Exporter &#39;import&#39;;
  our @EXPORT = &#39;try&#39;;

  sub try {
      my ($try, $catch) = @_;
      &amp;Try::Tiny::try($try, ($catch ? (&amp;Try::Tiny::catch($catch)) : ()));
  }

  sub try_parser {
      lex_read_space;
      die &quot;syntax error&quot; unless lex_peek eq &#39;{&#39;;
      my $try = parse_block;
      lex_read_space;

      my $catch;
      if (lex_peek(6) =~ /^catch\b/) {
          lex_read(5);
          lex_read_space;
          die &quot;syntax error&quot; unless lex_peek eq &#39;{&#39;;
          $catch = parse_block;
      }

      return (sub { ($try, $catch) }, 1);
  }</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<h2 id="DO-NOT-USE!"><a id="DO"></a><a id="DO-NOT-USE"></a>DO NOT USE!</h2>

<p>This module has fundamental errors in the way it handles closures, which are not fixable. Runtime keywords will never be able to work properly with the current design of this module. There are certain cases where this module is still safe to use (keywords that only have effect at compile time, or keywords that never call any of the <code>parse_*</code> functions), but that is limiting enough to make this module mostly worthless, and I likely won&#39;t be continuing to maintain it. Be warned!</p>

<p><b>NOTE: The API of this module is still in flux. I may make backwards-incompatible changes as I figure out how it should look.</b></p>

<p>This module allows you to write keyword-based syntax extensions without requiring you to write any C code yourself. It is similar to <a href="https://metacpan.org/pod/Devel::Declare">Devel::Declare</a>, except that it uses the Perl parser API introduced in Perl 5.14 in order to allow you to parse parts of things using perl&#39;s own parser, rather than having to fake it with balanced brace matching or other fragile things.</p>

<p>To use this module, you should pass a hashref to the <code>use</code> statement. The keys of this hashref are subroutines in the current package which should have special parsing behavior attached to them, and the values are coderefs which should be used to implement the custom parsing behavior.</p>

<p>The parsing coderefs will be called when perl encounters a call to the keyword that you attached custom parsing to. The current parser state will be directly after parsing the keyword. The parser function will receive the name of the keyword as a parameter, and should return a coderef which, when called at runtime, will produce the arguments to the function. In addition, if your keyword should be parsed as a statement (for instance, if you don&#39;t want to require a trailing semicolon), you can return a second, true value.</p>

<p>In order to actually handle the parsing itself, this module also exports various parsing functions, which you can call. See below for details.</p>

<h1 id="FUNCTIONS">FUNCTIONS</h1>

<h2 id="lex_peek($n)"><a id="lex_peek"></a><a id="lex_peek-n"></a>lex_peek($n)</h2>

<p>Returns a string consisting of the next <code>$n</code> characters in the input (or next one character, if <code>$n</code> isn&#39;t given). This string may be shorter than <code>$n</code> characters if there are fewer than <code>$n</code> characters remaining to read. The current position in the buffer to be parsed is not moved. See <a href="https://metacpan.org/pod/perlapi#PL_parser-%3Elinestr">&quot;PL_parser-&gt;linestr&quot; in perlapi</a> and <a href="https://metacpan.org/pod/perlapi#lex_next_chunk">&quot;lex_next_chunk&quot; in perlapi</a> for more information.</p>

<p>NOTE: This function currently only returns text that is on the current line, unless the current line has been fully read (via <code>lex_read</code>). This is due to a bug in perl itself, and this restriction will hopefully be lifted in a future version of this module, so don&#39;t depend on it. See the <a href="./Parse::Keyword.html#BUGS">&quot;BUGS&quot;</a> section for more information.</p>

<h2 id="lex_read($n)"><a id="lex_read"></a><a id="lex_read-n"></a>lex_read($n)</h2>

<p>Moves the current position in the parsing buffer forward by <code>$n</code> characters (or one character, if <code>$n</code> isn&#39;t given). See <a href="https://metacpan.org/pod/perlapi#lex_read_to">&quot;lex_read_to&quot; in perlapi</a> for more details.</p>

<h2 id="lex_read_space">lex_read_space</h2>

<p>Moves the current position in the parsing buffer forward past any whitespace or comments. See <a href="https://metacpan.org/pod/perlapi#lex_read_space">&quot;lex_read_space&quot; in perlapi</a> for more details.</p>

<h2 id="lex_stuff($str)"><a id="lex_stuff"></a><a id="lex_stuff-str"></a>lex_stuff($str)</h2>

<p>Inserts <code>$str</code> into the current parsing buffer at the current location, so that future calls to <code>lex_peek</code> and such will see it. Note that this does not move the current position in the parsing buffer, so multiple calls to <code>lex_stuff</code> at the same location will end up inserted into the buffer in reverse order. See <a href="https://metacpan.org/pod/perlapi#lex_stuff_sv">&quot;lex_stuff_sv&quot; in perlapi</a> for more information.</p>

<h2 id="parse_block,-parse_stmtseq,-parse_fullstmt,-parse_barestmt,-parse_fullexpr,-parse_listexpr,-parse_termexpr,-parse_arithexpr"><a id="parse_block"></a><a id="parse_block--parse_stmtseq--parse_fullstmt--parse_barestmt--parse_fullexpr--parse_listexpr--parse_termexpr--parse_arithexpr"></a>parse_block, parse_stmtseq, parse_fullstmt, parse_barestmt, parse_fullexpr, parse_listexpr, parse_termexpr, parse_arithexpr</h2>

<p>These functions parse the specified amount of Perl code, and return a coderef which will evaluate that code when executed. They each take an optional boolean parameter that should be true if you are creating a subroutine which will be going in the symbol table, or in other more obscure situations involving closures (the CVf_ANON flag will be set on the created coderef if this is not passed - see <code>t/unavailable.t</code> in this distribution). See <a href="https://metacpan.org/pod/perlapi#parse_block">&quot;parse_block&quot; in perlapi</a>, <a href="https://metacpan.org/pod/perlapi#parse_stmtseq">&quot;parse_stmtseq&quot; in perlapi</a>, <a href="https://metacpan.org/pod/perlapi#parse_fullstmt">&quot;parse_fullstmt&quot; in perlapi</a>, <a href="https://metacpan.org/pod/perlapi#parse_barestmt">&quot;parse_barestmt&quot; in perlapi</a>, <a href="https://metacpan.org/pod/perlapi#parse_fullexpr">&quot;parse_fullexpr&quot; in perlapi</a>, <a href="https://metacpan.org/pod/parse_listexpr">parse_listexpr</a>, <a href="https://metacpan.org/pod/parse_termexpr">parse_termexpr</a>, and <a href="https://metacpan.org/pod/perlapi#parse_arithexpr">&quot;parse_arithexpr&quot; in perlapi</a> for more details.</p>

<h2 id="compiling_package">compiling_package</h2>

<p>Returns the name of the package that the keyword which is currently being parsed was called in. This should be used instead of <code>caller</code> if you want to do something like install a subroutine in the calling package.</p>

<h1 id="BUGS">BUGS</h1>

<p>Peeking into the next line is currently (as of 5.19.2) broken in perl if the current line hasn&#39;t been fully consumed. This module works around this by just not doing that. This shouldn&#39;t be an issue for the most part, since it will only come up if you need to conditionally parse something based on a token that can span multiple lines. Just keep in mind that if you&#39;re reading in a large chunk of text, you&#39;ll need to alternate between calling <code>lex_peek</code> and <code>lex_read</code>, or else you&#39;ll only be able to see text on the current line.</p>

<p>This module also inherits the limitation from <a href="./Devel::CallParser.html">Devel::CallParser</a> that custom parsing is only triggered if the keyword is called by its unqualified name (<code>try</code>, not <code>Try::try</code>, for instance).</p>

<p>This module doesn&#39;t yet work with lexical subs, such as via <a href="https://metacpan.org/pod/Exporter::Lexical">Exporter::Lexical</a>. This will hopefully be fixed in the future, but will likely require modifications to perl.</p>

<h1 id="SEE-ALSO"><a id="SEE"></a>SEE ALSO</h1>

<p><a href="./Devel::CallParser.html">Devel::CallParser</a></p>

<p><a href="https://metacpan.org/pod/Keyword::API">Keyword::API</a></p>

<p><a href="https://metacpan.org/pod/Devel::Declare">Devel::Declare</a></p>

<h1 id="SUPPORT">SUPPORT</h1>

<p>You can find this documentation for this module with the perldoc command.</p>

<pre><code>    perldoc Parse::Keyword</code></pre>

<p>You can also look for information at:</p>

<ul>

<li><p>MetaCPAN</p>

<p><a href="https://metacpan.org/release/Parse-Keyword">https://metacpan.org/release/Parse-Keyword</a></p>

</li>
<li><p>RT: CPAN&#39;s request tracker</p>

<p><a href="http://rt.cpan.org/NoAuth/Bugs.html?Dist=Parse-Keyword">http://rt.cpan.org/NoAuth/Bugs.html?Dist=Parse-Keyword</a></p>

</li>
<li><p>Github</p>

<p><a href="https://github.com/haarg/Parse-Keyword">https://github.com/haarg/Parse-Keyword</a></p>

</li>
</ul>

<h1 id="AUTHOR">AUTHOR</h1>

<p>Jesse Luehrs &lt;doy@tozt.net&gt;</p>

<h1 id="COPYRIGHT-AND-LICENSE"><a id="COPYRIGHT"></a>COPYRIGHT AND LICENSE</h1>

<p>This software is Copyright (c) 2013 by Jesse Luehrs.</p>

<p>This is free software, licensed under:</p>

<pre><code>  The MIT (X11) License</code></pre></div>

<div id="metacpan_install-instructions-dialog" class="modal fade">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title">Module Install Instructions</h4>
      </div>
      <div class="modal-body">
        <p>To install Parse::Keyword, copy and paste the appropriate command in to your terminal.</p>
        <p><a href="https://metacpan.org/dist/App-cpanminus/view/bin/cpanm">cpanm</a></p>
        <pre><code>cpanm Parse::Keyword</code></pre>
        <p><a href="https://metacpan.org/pod/CPAN">CPAN shell</a></p>
        <pre><code>perl -MCPAN -e shell
install Parse::Keyword</code></pre>
        <p>For more information on module installation, please visit <a href="https://www.cpan.org/modules/INSTALL.html">the detailed CPAN module installation guide</a>.</p>
      </div>
      <div class="modal-footer">
        <a href="./Parse::Keyword.html#" data-dismiss="modal" class="btn">Close</a>
      </div>
    </div>
  </div>
</div>
          </main>
          <div class="content-pagination">
          </div>
        </div>
        <footer class="footer">
          <div class="footer-container">
            <div class="footer-social">
              <div class="footer-link footer-logo">
                <a href="https://metacpan.org/">
                  <img src="https://metacpan.org/static/images/metacpan-logo.svg" alt="MetaCPAN" />
                </a>
              </div>
              <a class="footer-social-link" href="https://github.com/metacpan">
                <i class="fab fa-github-square"></i>
              </a>
              <a class="footer-social-link" href="https://fosstodon.org/@metacpan">
                <i class="fab fa-mastodon"></i>
              </a>
            </div>
            <div class="footer-links">
              <div class="footer-link">
                  <a href="https://metacpan.org/about">About</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/about/sponsors">Sponsor</a>
              </div>
              <div class="footer-link">
                  <a href="https://grep.metacpan.org">grep::cpan</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/recent">Recent</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/about/faq">FAQ</a>
              </div>
              <div class="footer-link">
                  <a href="https://metacpan.org/tools">Tools</a>
              </div>
              <div class="footer-link">
                  <a href="https://fastapi.metacpan.org/">API</a>
              </div>
              <div class="footer-link">
                  <a href="https://www.perl.org/">Perl.org</a>
              </div>
            </div>
            <div class="footer-sponsors">
              <a class="footer-sponsor-link" target="_blank" href="https://www.bytemark.co.uk/" rel="noopener">
                <img class="footer-sponsor-bytemark" src="https://metacpan.org/static/images/sponsors/bytemark_logo.svg" alt="Bytemark logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://www.liquidweb.com/" rel="noopener">
                <img class="footer-sponsor-liquidweb" src="https://metacpan.org/static/images/sponsors/liquidweb_logo.png" alt="liquidweb logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://deriv.com/careers/" rel="noopener">
                <img class="footer-sponsor-deriv" src="https://metacpan.org/static/images/sponsors/deriv.svg" alt="Deriv logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://geocode.xyz" rel="noopener">
                <img class="footer-sponsor-geocode" src="https://metacpan.org/static/images/sponsors/geocodelogo.svg" alt="Geocode logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://www.fastly.com/" rel="noopener">
                <img class="footer-sponsor-fastly" src="https://metacpan.org/static/images/sponsors/fastly_logo.svg" alt="Fastly logo">
              </a>
              <a class="footer-sponsor-link" target="_blank" href="https://opencagedata.com" rel="noopener">
                <img class="footer-sponsor-opencage" src="https://metacpan.org/static/images/sponsors/open-cage.svg" alt="OpenCage logo">
              </a>
            </div>
          </div>
        </footer>
        <div class="modal fade" tabindex="-1" role="dialog" id="metacpan_keyboard-shortcuts">
          <div class="modal-dialog">
            <div class="modal-content">
              <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                <h4 class="modal-title">Keyboard Shortcuts</h4>
              </div>
              <div class="modal-body row">
<div class="col-md-6">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>Global</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>s</kbd>
        </td>
        <td>Focus search bar</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>?</kbd>
        </td>
        <td>Bring up this help dialog</td>
      </tr>
    </tbody>
  </table>

  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>GitHub</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>p</kbd>
        </td>
        <td>Go to pull requests</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>i</kbd>
        </td>
        <td>go to github issues (only if github is preferred repository)</td>
      </tr>
    </tbody>
  </table>
</div>

<div class="col-md-6">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>POD</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>a</kbd>
        </td>
        <td>Go to author</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>c</kbd>
        </td>
        <td>Go to changes</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>i</kbd>
        </td>
        <td>Go to issues</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>d</kbd>
        </td>
        <td>Go to dist</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>r</kbd>
        </td>
        <td>Go to repository/SCM</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>s</kbd>
        </td>
        <td>Go to source</td>
      </tr>
      <tr>
        <td class="keys">
          <kbd>g</kbd> <kbd>b</kbd>
        </td>
        <td>Go to file browse</td>
      </tr>

    </tbody>
  </table>
</div>

<div class="col-md-12">
  <table class="table keyboard-shortcuts">
    <thead>
      <tr>
        <th></th>
        <th>Search terms</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td><em>module:</em> (e.g. <a href="https://metacpan.org/search?q=module%3APlugin">module:Plugin</a>)</td>
      </tr>
      <tr>
        <td><em>distribution:</em> (e.g. <a href="https://metacpan.org/search?q=distribution%3ADancer+auth">distribution:Dancer auth</a>)</td>
      </tr>
      <tr>
        <td><em>author:</em> (e.g. <a href="https://metacpan.org/search?q=author%3ASONGMU+Redis">author:SONGMU Redis</a>)</td>
      </tr>
      <tr>
        <td><em>version:</em> (e.g. <a href="https://metacpan.org/search?q=version%3A1.00">version:1.00</a>)</td>
      </tr>
    </tbody>
  </table>
</div>
              </div>
              <div class="modal-footer"></div>
            </div>
          </div>
        </div>
    </body>
</html>
